Jirui Ma, Xiaopeng Lu, Santosh Prasad Sah, Qianqian Chen, You Zhang, and Fuhui Wang, Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2876-x
Cite this article as:
Jirui Ma, Xiaopeng Lu, Santosh Prasad Sah, Qianqian Chen, You Zhang, and Fuhui Wang, Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2876-x
Research Article

Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions

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  • Received: 12 October 2023Revised: 4 March 2024Accepted: 5 March 2024Available online: 7 March 2024
  • In order to enhance the long-term corrosion resistance of the plasma electrolytic oxidation (PEO) coating on Mg alloy, an inorganic salt is used in combination with corrosion inhibitors for post-treatment of the coating. In this study, corrosion performance of PEO-coated AM50 Mg was significantly improved by sodium lauryl sulfonate (SDS) and sodium dodecyl benzene sulfonate (SDBS) loaded into the Ba(NO3)2 post-sealing solution. SEM, XPS, XRD, FTIR, and UV-Vis analyses showed that the inhibitors enhanced the deposition of BaO2 on the coating surface. Electrochemical impedance showed that the post-sealing in SDS containing electrolyte enhanced corrosion resistance of the sample by three orders of magnitude. After immersing in 0.5wt% NaCl solution for 768 h, the total impedance value remained at 106 Ω/cm². 40 days of continued salt spray test virtually did not show any obvious region of corrosion, proving the excellent corrosion performance of the coatings after performing post-treatment. The corrosion resistance of the coating was enhanced through the synergistic effect of deposition products and adsorption of inhibitors.

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